Synthesis, crystal structure, and thermoelectric properties of layered antimony selenides reosbse2 (RE = La, Ce)

Yosuke Goto, Akira Miura, Ryosuke Sakagami, Yoichi Kamihara, Chikako Moriyoshi, Yoshihiro Kuroiwa, Yoshikazu Mizuguchi

研究成果: Article査読

9 被引用数 (Scopus)

抄録

Inspired by the recent first-principles calculations showing the high thermoelectric performance of layered pnictogen chalcogenides, we experimentally characterise the crystal structure and high-temperature transport properties of the layered antimony selenides REOSbSe2 (RE = La, Ce). The crystal structure of REOSbSe2 was the tetragonal P4=nmm space group, consisting of alternate stacks of SbSe2 and REO layers. These two compounds were n-type semiconductors. The optical band gaps of LaOSbSe2 and CeOSbSe2 were evaluated to be 1.0 and 0.6 eV, respectively. The room-temperature thermal conductivity was 1.5 W m−1 K−1 for RE = La and 0.8 W m−1 K−1 for RE = Ce. These relatively low thermal conductivities were comparable to those of isostructural layered bismuth chalcogenides. We substituted O2− with F ions to introduce electrons as charged carriers to optimize the thermoelectric performance, but increasing the electrical conductivity was still challenging.

本文言語English
論文番号074703
ジャーナルJournal of the Physical Society of Japan
87
7
DOI
出版ステータスPublished - 2018 1 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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